JPS6392850A - Vibration isolator - Google Patents

Abstract

PURPOSE:To simplify the fixing of a vibration isolator by supporting at least each one end of flat springs in a casing movably in their longitudinal direction, and mounting a mass body on about middle parts between supporting points of said flat springs, and supporting said mass body by viscous dampers. CONSTITUTION:Flat springs 4 are suspended in casing 2 with both their ends supported by supporting parts. Each one end of said flat springs 4 is fixed to the casing 2 as a fixedly supported part 5, and the other end is movably supported in their longitudinal direction as a movably supported part 6. A mass body 8 is mounted on about middle positions between both said supported parts of said springs 4, and supported by viscous dampers 9. A vibration isolator can be therefore simply fixed to a structure to be subjected to vibration.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a novel anti-vibration S! Regarding construction, especially structures and l! M
The present invention relates to a vibration isolating device for damping vibrations of equipment, etc.

[Prior Art] Conventionally, structures, equipment, etc. have adopted a vibration isolation structure as shown in FIG. As shown in the figure, for example, the vibration isolation structure of chimney a can be reinforced by attaching ribs b etc. to the base of chimney a, or by hanging a stay @ from another building C etc. to the middle part of chimney a in the height direction. Anti-vibration structures were adopted, such as supporting the chimney by passing it over, or adding a heavy object e to the upper end of the chimney a.

These vibration isolation structures have been used alone or in combination.

[Problems to be Solved by the Invention] By the way, the above-mentioned prior art has the following problems.

Even when the above-mentioned vibration isolation structure is adopted from the design stage of structures, equipment, etc., there is a problem in that the amount of materials and man-hours increase.

Especially when there is post-construction work after the completion of a structure or VI device, etc.
In cases where post-construction work is required due to changes in the ship's operating conditions (decelerated operation, main engine replacement, etc.), not only will the amount of materials and man-hours described above increase, but there will also be problems such as there being no space to hand over the stage (II), etc. There has been a problem in that it is difficult to employ the above-mentioned vibration isolation structure due to various limiting conditions.

In view of the above-mentioned problems, an object of the present invention is to provide a vibration isolator that can improve the degree of freedom in designing structures, equipment, etc.

Another object of the present invention is to provide a vibration isolator that is simple in structure, small in size, and lightweight.

Furthermore, another object of the present invention is to provide a vibration isolating device that has a wide range of damping applications and is rich in versatility.

[Means for Solving the Problems] In order to solve the problems in the prior art, the present invention provides a structure in which a leaf spring is suspended in a casing perpendicularly to the vibration direction, and at least one end of the leaf spring is A mass body is movably supported along the longitudinal direction, and a mass body is added approximately at the center between the support points of the leaf spring, and a viscous damper supports this mass body from the casing along the vibration direction.

[Function] The movement of the movable support portion of the leaf spring configured as described above and housed in the casing adjusts the mass of the JHk1 mass body and the capacity of the viscous damper to dampen structures, equipment, etc. that are to be damped. When the above-mentioned casing is attached to the above-mentioned structure, equipment, etc. in accordance with the natural frequency, this casing will be photographed together with the above-mentioned structure, equipment, etc., but inside this casing, the mass M body will be attached to the above-mentioned structure, equipment, etc. It vibrates in the opposite direction to the vibration to attenuate the imaging.

[Example] An embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

The vibration isolator of the present invention is constructed as shown in FIGS. 1, 2, and 3. As shown in the figure, the casing 2 of the protection 1 [1i11 is I! It is formed of an IJ box. The outer wall of this casing 2 is equipped with a vibration isolator 1 for structures, equipment, etc.
A plurality of mounting fittings 3 are provided for mounting. A plate spring 4 is suspended within the casing 2 with both ends supported. This leaf spring 4 is stretched perpendicularly to the direction of vibration to be damped. In this embodiment, the leaf springs 4 are provided in parallel in the casing 2 in two rows in the thickness direction and in two rows in the width direction.

One end of each of these four rows of leaf springs 4 is formed into a coiled spring shape, and is fixed to the casing 2 as a fixed support part 5 with a bolt. In addition, the other end is formed straight,
The movable support part 6 is supported by bolts so as to be movable along the longitudinal direction of the leaf spring 4. A plurality of protrusions 7 are formed on the movable support part 6 side of the leaf spring 4 at equal intervals along its longitudinal direction, and these protrusions 7 allow the movable support part 6 to move on the leaf spring 4 in a step-like manner. It is designed to be movable. In this embodiment, only one end portion is configured as the movable support portion 6 as described above, but both ends of the leaf spring 4 may be configured as the movable support portion 6, or the movable support portion 6 may be made to slide 31-wise on the leaf spring 4. A mass body 8 is loaded approximately at the center of the plate spring 4 between the support points of the fixed support part 5 and the movable support part 6. This mass body 8 is formed of, for example, a plurality of weights. These weights are quickly and detachably connected with stud bolts, making the weight variable.

One end of a viscous damper 9 is attached to the mass body 8, and the other end of this viscous damper 9 is attached to the casing 2. This viscous damper 9 is provided along the vibration direction of a structure, equipment, etc., and supports the mass body 8 from the casing 2. This viscous damper 9 is formed of, for example, a hydraulic cylinder.

Next, the operation of the vibration isolator 1 of the present invention constructed as described above will be described.

The leaf spring 4, mass body 8, and viscous damper 9 housed in the casing 2 are adjusted to match the natural frequency of the structure, equipment, etc. to be damped. Specifically, the adjustment is made by changing the number of leaf springs 4, the amount of movement of the movable support portion 6 that supports the leaf springs 4, the mass of the mass body 8, and the capacity of the viscous damper 9. Then, the casing 2 of the vibration isolator 1 after adjustment
is attached to the structure, equipment, etc. to be attenuated using the mounting bracket 3. At this time, the leaf spring 4 is suspended perpendicularly to the vibration direction of the structure or equipment, and the viscous damper 9 supports the mass body 8 along the vibration direction. Attach as shown. When the above structure, equipment, etc. vibrate, the casing 2 of the vibration isolator 1 attached thereto also vibrates. When the casing 2 vibrates together with structures, equipment, etc., the mass body 8 attached to the leaf spring 4 becomes resonant near its natural frequency and vibrates in the opposite direction to the vibration of the casing 2. The inertia force due to the vibration of the mass body 8 is transmitted to the casing via the fixed support part 5, the movable support part 6, and the viscous damper 9, and is further transmitted to the mounting bracket 3.
The vibrations of the structures and equipment are damped by acting on the structures and equipment through the vibration.

This is the ff! protection as shown in Figure 3. This became clear when the V device 1 was manufactured and an experiment was conducted to confirm the attenuation effect. The structure used in this experiment was
The vibration damping device 1 was set on the top surface of the structure, and a vibration load was applied using an oscillator to confirm the vibration response of the structure.

As a result, a resonance curve as shown in FIG. 4 was obtained. According to this resonance curve, the vibration isolator v! ! The amplitude B of the structure to which the vibration isolator 1 is attached shows a damping effect of about -65% with respect to the amplitude A of the structure to which the vibration isolator 1 is not attached.

As described above, according to the vibration isolator 1 of the present invention, it is possible to obtain a very large damping effect and it is easy to attach to structures, equipment, etc., so the degree of freedom in designing structures, equipment, etc. is increased. Since it is improved and has a simple structure, it can be made smaller and lighter.

[Effects of the Invention] In summary, the present invention exhibits the following excellent effects.

(1) Since the damping element is housed within the casing, it can be easily attached to structures, equipment, etc. that are subject to vibration isolation, and the degree of freedom in designing structures, equipment, etc. can be improved.

(2) Since it has a simple structure that includes a leaf spring, a mass body, and a viscous damper inside the casing, it is possible to manufacture a small and lightweight vibration isolating device.

(3) Number of leaf springs, movement of the movable support part of the leaf spring,
By changing the mass of the mass body and the capacity of the viscous damper, the application range of damping can be widened, making it highly versatile.

[Brief explanation of the drawing]

Fig. '1 is a schematic side view showing an embodiment of the anti-JFx device of the present invention, Fig. 2 is a view taken along the line I[-I[ of Fig. 1, Fig. 3 is a detailed view of Fig. 1, FIG. 4 is a graph showing the resonance curve of the vibration isolator of the present invention, and FIG. 5 is a schematic diagram showing how the conventional vibration isolator is attached to a structure. In the figure, 1 is a vibration isolator, 2 is a casing, 4 is a leaf spring, and 6
8 is a movable support part, 8 is a mass body, and 9 is a viscous damper. Patent applicant: Ishikawajima-Harima Heavy Industries Co., Ltd. Representative patent attorney: Nobuo Kinuya 7;
: Board Hachine 9: I-Zen-Kei-E-Danha. Figure 2 Figure 3 Figure 4 Figure 5

Claims (2)

[Claims] (1) A leaf spring that is suspended perpendicularly to the vibration direction within the casing and whose at least one end is movably supported along its longitudinal direction; 1. A vibration isolating device comprising: a mass body with a casing; and a viscous damper that supports the mass body from a casing along the vibration direction of the mass body. (2) The vibration isolator according to claim 1, wherein a plurality of the plate springs are provided in parallel.